class-7 Computer Chapter-3 Solved

 Class-7

Chapter-3

A.      Short Questions.

Q.1.               Explain the term “Operating System’?

Ans.         An operating System or OS is a special set of programs that controls various hardware devices of the computer.

Q.2.               Write the main purpose of an operating system.

Ans.         Offers a friendly interface between the user and the computer.

Q.3.               Give difference between a file and folder.

Ans.         Folder : Just like real world folders, a folder in MS Windows are used to store files.

                  File : It is a collection of data or information stored in a computer.

Q.4.               What is navigation pane?

Ans.         The Navigation Pane lists all of the drives, history, desktop, and downloads that used to be on the Places bar.

B.      Long Questions

Ques.1.    Sam has prepared an assignment on his laptop, but when he brought it to school he could not open his word file in the school computer. Why? How can he solve this problem?

Ans:         May be Sam prepared his word file in latest version and school’s computer have earlier version so he could not open that file. Sam need either change the file version of his laptop or update school’s computer software.

Ques.2.    Rajni by mistake deleted her important files. She was very much troubled. Help her to retrieve those files? 

Ans          When we delete a file/folder in windows, it is placed in the Recycle Bin. The item is temporarily stored in it before being permanently deleted by the user. Rajni can restore her important file with the help of Recycle Bin.

C.      Choose the correct answer.

1.             The MS windows comes with four different

Ans: d. Libraries.

2.             Just like real world folder, a _____ in MS windows is used to store files.

Ans. b. folder

3.             The _______ represents for any number of characters.

Ans. C. * ?!

4.             For removing the deleted files permanently from the computer we select ____.

Ans. a Empty Recycle Bin

5.             A file name has two parts : primary name and _________

Ans. a. extension

D.      Fill in the blanks.

a.       A file is a collection of data or information stored in a computer.

b.      The Control Panel is a component of the Microsoft Windows Graphical User Interface.

c.       A folder in MS Windows is used to store files.

d.      Recycle Bin is like the computer’s dustbin.

E.       Define the following.

A File : It is a collection of data or information stored in a computer.

          Navigation Pane: The Navigation Pane lists all of the drives, history, desktop, and downloads that used to be on the Places bar.

Folder : Just like real world folders, a folder in MS Windows are used to store files.

Address Bar : An address bar is a component of an Internet browser which is used to input and show the address of a website.

F.       Match the following.

Column A                                                                            Column B

1. Launch window help and support                                   b. + F1

2. Name of Computer file                                                    d. File Name

3. Data files are stored                                                         e. Folder

4. Wild characters                                                                 a. *, ?   

5. Deleted Files                                                                     c. Recycle Bin    

G.     Who am I?

1.       I let you access a file quickly. I am generally placed on the desktop.        Address Bar

2.       I help to uninstall the programs from the computer.                                  Control Panel

3.       I help to view, explore, and organize files and folders.                             Navigation Pane

H.      Write Steps to:

1.       Rename a File:

Ans.                  Step 1: Firstly, we open the folder where a certain file is located.

                          Step 2: We click on the file which we want to rename.

                          Step 3: We press F2 function key.

                          Step 4: Finally, we type the new name for our file.

2.       Search for a file.

Ans.            Step 1 : Press the Windows key to access the Windows Start screen.

Step 2 :Start typing part of the file name you want to find. As you type results for your search are shown. ...

Step 3 :Click the drop-down list above the Search text field and select the Files option.

Step 4 :The search results are shown below the Search text field.

3.       Empty the Recycle bin.

Ans.           Step 1. Right-click on your recycle bin

Step 2. Select empty recycle bin

Step 3. Empty the Recycle Bin

Step 4. Click on yes button.

Recycle bin will be empty.

4.       Restored the deleted file.

Ans.                 Step-1. Type Restore files in the search box on the taskbar, and then select Restore your files with File History.

Step-2. Look for the file you need, then use the arrows to see all its versions.

Step-3. When you find the version you want, select Restore to save it in its original location.

 

 

Class-8 computer Chapter-3 Solved

 

Chapter-3

A. Short Questions

Q.1 Write full form of HTML?

Ans. Hypertext Markup Language

Q.2 Write full Form of XML?

Ans. Extensible Markup Language

B. Long Questions.

Q.1 Where is the text of the title tag displayed?

Ans. The HTML document, <Title> element is a container element started by <Title> tag and ended by </Title> Tag. Title element is placed within the Head element. This consists of the text that will appear in the title bar of the web browser window.

Q.2 What are the different levels of headings in HTML?

Ans. H1, H2, H3, H4, H5 and H6 are heading tags for creating headings on a web page in HTML. They are used to display titles and subtitles on a web page. They are written in pairs with opening and closing tags.

Q.3 Write the attributes of Font Tag?

 Ans. Attributes of Font Tags

1.       Face – We use this attribute to specify the name of the font.

2.       Size – We use this attribute to specify the font size between 1 and 7 (7 is the largest)

3.       Color – We use color attribute as it specifies the color of the text.

Q.4 Write the steps for creating a simple HTML documents?

Ans. For Creating a simple HTML document we follow given steps:-

Step-1 – Firstly we open a text editor e.g. Notepad.

Step-2 – Then we choose the ‘New Option’ from the menu.

Step-3 – We write the HTML content.

Step-4 - Save the file by choosing Save As Option From the File menu.

Step-5 – In the Save As Dialog Box, while naming the file, we give the extension as htm or html.

Step-6 – Finally, we click on save button.

C. Put a tick () mark on the correct option.

1. XML stands for________.

Ans. b. Extensible Markup Language

2. HTML Stands for_____________ .

Ans. a. Hypertext Markup Language

3. The <HR> tag insert ______ on a web page.

Ans. a. A straight line

4. __________ tag is used for inserting a line break.

Ans. b. <BR>

5. <B> </B> tag is helpful in

Ans. a. Enclosed text becomes bold

D. Write steps to:

1. Reload the document in the web browser.

Ans. Reloading the document in the web browser we follow given steps:-

        Step-1- We can return to the web browser window where the last version of the file was shown.

        Step-2 – To view the changes, we click the Refresh/Reload button is located on the web browser.

2. View a File in a Browser.

Ans. Viewing an HTML File in a Browser we follow given steps:-

        Step-1 – Firstly we open the browser software. For example – Internet Explorer.

        Step-2 – Then we choose File> Open.

        Step-3 – Then, we locate the web page that we wish to see.

        Step-4 – Finally, We click Open

E. Fill in the blanks.

1. The title of your website should be written between the <title> and </title> tags.

2. Everything that shows on the web page is between the <Body> and </Body> tags.

3. </P> is the tags for paragraph break.

4. Each heading level displays heading using a different heading Number.

5. An HTML file has the extension htm or html.

F. Fun Time

1. COTNANIER                - CONTAINER

2. TTABRTUISE               - ATTRIBUTES

3. LGANUGEA                 - LANGUAGE

4. BROSWER                   - BROWSER

5. BCKAGRNOUD            - BACKGROUND

 

 

 

 

 

 

Class -7 computer Chapter-2 Solved

Chapter-2

Q.1 In 1980s, with intention a virus was designed?

Ans. A virus was designed which caused all the character on the screen to drop at the bottom of the display.

Q.2 How can you define a computer virus?

Ans. A computer virus is a program or set of programs, designed in a way to spread from one computer to another to affect the normal functioning of a computer.

B. Long Question.

Q.1 How can we remove a computer virus?

Ans. We can remove a computer virus by Antivirus software. We can buy Antivirus software from computer store or download from the internet.

Q.2 Write the five steps to keep a computer safe from a virus.

Ans.       Step.1 Do not use any pirated software.

                2. We should not download unknown software of low quality software available as ‘Freeware’ on internet.

                3. Never open any e-mail from unidentified senders.

                4. To be double safe, scan everything that we want to download.

                5. We should back up our regularly and store back ups at separate place so that we can recover our data with clean virus free copies.

Q.3 What is spyware?

Ans. It gathers information about a particular user or organization without its knowledge.

Q.4 “All the viruses behave differently ‘ Comment on this statement.

Ans. Although every computer virus is not harmful but most of them leave a harmful effects on a computer system. The actual effect of any virus depends on how it was programmed by the creator of the virus program.

C. Tick () mark the correct option.

1. The present age belongs to

Ans. c. Information Technology

2. Which anti-virus is famous for high detention rate?

Ans. a. Kaspersky

3. The _______ programs perform unauthorized action on computers.

Ans. d. trojan

4. ________ software is used to remove computer virus.

Ans. b. anti-virus

D. Give the difference between.

1. Trojan and worm

Ans. Trojan : The Trojan program unauthorized action on computers. They can delete information on drives, make the system hang, steal confidential information etc. For example The PWSteal, Trojan

Worm: A worm exploits operating system to spread itself. The class was named for the way the worms move from computer to computer using networks and e-mails.

E.  Fill in the blanks

1.       We can take help of many anti-virus programs to remove viruses.

2.       We should not download unknown software of low quality software are available as free wall on internet.

3.       It does not appear on a computer by it can make copies of itself.

4.       A worm mainly exploits operating systems to spread itself.

5.       We must keep our regularly up-to-date.

   F. Jumbled words.

1. TNONRA  - Norton                                      2. SYTESM – System

3. ACMEEf – Mcafee                                       4. EPRKYSKAS - Kaspersky

Class-6 Chapter-2 Solved Exercise

 

Chapter-2

A. Tick ( ) Mark the correct Option

1. It is used for calculating and comparing:

Ans.  a. ALU

2. The physical devices that we can touch and feel are called _______.

Ans.  b. hardware

3. The _______ of a computer includes Arithmetic Logic Unit and the Control Unit.

Ans.  c. CPU

4. The Full form of ROM:

Ans.  c. Read Only Memory

B. Fill in the blanks

1. The computer mainly works on two components: Hardware and Software.

2. External memory is known as Secondary Memory too.

3. The main memory consists of Primary and Secondary Memory .

4. ROM is the non-volatile memory of the computer.

5. RAM  is read/writable memory of the computer.

C. Short Questions.

Q.1.  What do you mean by input device?

Ans.  Input Devices receive input from the user in the form of raw data.

Q.2 What is the full form of ALU? What is its function?

Ans.  ALU ( Arithmetic and logical Unit)

Arithmetic operations include all (+, - , /, *) etc. and all logical operations are those operations which involve logical operators (NOT, AND, OR) and result in True or False.

Q.3 Write about the function of the control unit.

Ans. Control Unit ensures that all the other parts of the processor do whatever is instructed to them.

D. Long Questions ;-

Q.1 Which two functions does the arithmetic and logic unit perform?

 Ans. Arithmetic operations include all (+, - , /, *) etc. and all logical operations are those operations which involve logical operators (NOT, AND, OR) and result in True or False.

Q.2 How does increase in size of RAM increase the speed of the computer?

Ans.  RAM leads to the increase in the data which we can store at one point of time. It enables us to run multiple programs simultaneously.

E. Give the difference between :

Q.1 Input Device and Output Device.

Ans.       Input Device : Input Devices receive input from the user in the form of raw data.

                Output Device : Output Devices are mainly used to display information (Output) to the user.

Q.2 Primary memory and Secondary Memory.

Ans.       Primary Memory: A primary memory (internal memory) is the main memory of the computer.

                Secondary Memory : Secondary Memory is also known as external Memory. Normally, it stores the information for much longer time.

F. Name any two:

Q.1 Components of a computer

Ans.   Hardware  and Software

Q.2 Memory Chip

Ans:  Primary and Secondary Memory

G. Give the full form of :

1. CPU – Central Processing Unit

2. RAM – Random Access Memory

3. ALU – Arithmetic Logical Unit

4. ROM – Read only Memory

 

 

 

 

 

 

 

 

                                                                                      

Class -8 Chapter-2 Solved

 

Chapter-2

A. Short Questions

Q.1 Differentiate between a line chart and pie chart.

Ans.       Line Chart : A line chart shows a trend in data at equal intervals.

                Pie Chart : A pie chart shows the proportional size of the items included in a single data series.

Q.2  What is the purpose of conditional formatting?

Ans. Conditional formatting refers to the setting a format on a cell based on a condition.

B. Long Question

Q.1 Explain a few elements of charts.

Ans.       Legends : They link the colour-coding to the actual data series.

                Gridlines: A system of gridlines that are parallel to the x-axis and /or y axis.

                Plot Area: The area bound by axis where the data is displayed.

                Chart area: The complete region covering the entire chart with all its elements.

Q.2 What is mixed cell referencing?

Ans.  A cell address contains two parts- coloumn-letter and row-number. Hence, $B3 is a mixed reference, because B is absolute while 3 is relative.

C. Put tick () mark on the correct option.

1. A pictorial representation of data on Excel worksheet is called:

Ans. c. Chart

2. The set of data that is that is displayed on a chart is called _____

Ans.  a. Data Series

3. _____ is a good tool for plotting charts.  

Ans. C. Both of the above

4. Different types of cell referencing is/are:

Ans. d. All of the above

5. _____ sign is used to hold a column and /or row reference constant.

Ans. b. $

D. Fill in the blanks.

1. Microsoft Excel is a spreadsheet program that runs on Windows Environment.

2. Conditional Formatting refers to the setting a format on a cell based on a condition.

3. Plot Area is the area bound by the axis where the data is displayed.

4. The Legends links the color-coding to the actual data series.

5. Conditional Formatting is a feature that helps to set a format on a cell based on a condition.

E. Write T for True statement and F for False statement:

1. The legends link the color-coding to the actual data series.                                      T

2. $D$12 is an example of Mixed cell referencing.                                                             T

3. We can change the Axis Title of a Pie Chart.                                                                    T

4. Worksheet is pictorial representation of chart.                                                              F

5. The Data Lebels can be added in the center of the Bar Chart.                                  F

F. Define the following:

1. Pie Chart

Pie Chart : A pie chart shows the proportional size of the items included in a single data series.

2. Mixed Cell referencing

Mixed Cell referencing:  A cell address contains two parts- coloumn-letter and row-number. Hence, $B3 is a mixed reference, because B is absolute while 3 is relative.

G. Write steps to do the following jobs:

1. Move a chart

Ans.     Step 1 : Firstly , we right click on the chart.

            Step 2 : Then, we select ‘Move Chart’ from the shortcut menu.

            Step 3 : Now, we select Sheet name where to place the chart.

            Step 4: Now, we click ok.

2. Resize a chart

Ans.     Step 1 : Firstly , we move the mouse over the size handles.

            Step 2 : The dots around the edges of the chart are the sizing handles.

            Step 3: When the mouse change shape to a double-headed arrow.

            Step 4: Hold down the left mouse button.

            Step 5: Then drag to a new location. we can also resize the corner of the edges.

 

 

 

 

 

 

 

 

 

 

 

Class-7 (Computer) Chapter -1

 

A. Short questions:

Q.1 Write the names of two types of software.

Ans.       1. System Software                         2. Application Software.

Q.2 Give names of four utilities software.

Ans.       1. Screen Saver                                                 2. Antivirus program

                3. Disk Cleanup Programs             4. Disk defragmenter

B. Long questions:

Q.1 What is the use of a language processor.

Ans. The software that translate is a type of system software called Language Processor

                  

 

Q.2  Explain high level language?

Ans. We write programs in computer language, e.g. BASIC, C++, Java etc. using words of English. Such languages are called High-level languages.

Q.3 Give an example of programming language and its purpose.

Ans. COBOL : This language is helpful in business applications.

C. Tick () mark the correct options:

1. The components that can be touched, felt and seen are called ________.

Ans.       b. Hardware

2. Computer- aided design is used to _________.

Ans.       b. Produce engineering

3. MS-WORD, MS Excel, TALLY are the examples of _________.

Ans.       b. Ready-made software

4.Machine Code consists of :

Ans.       b. 0s and 1s

D . Give the difference between

Q.1 Compilers and interpreters.

Ans. Compilers : A compiler is also a software program that translates an entire program written in high level language into machine language.

Interpreters: An interpreter is a software program that translates a high level language program into machine language. The translation is done line by line.

Q.2 Application Software and system software.

Ans. Application Software: Applications Software are set of programs that are put together for specific purpose or task.

System Software: System Software are a set of specially designed for performing tasks such as, controlling the computer hardware and utilizing the resources to help the application software to solve our specific problems.

E. Fill in the blanks

1. A programs is a set of Instructions that performs a special task.

2. Software is a set of programs.

3. A Compiler is also a software program that translates an entire program written in high level language into machine language.

4. An  Interpreter is a software program that translates a high level language program into machine language.

5. Fortran, C++, COBOL, JAVA, HTML, and LOGO are all Programming language.

F. Give the full Forms.

1. DTP : Desktop Publishing Package

2. OS : Operating System

3. CPU : Central Processing Unit

4. CAD :  Computer-aided design